Busch’s car landed on its roof. Crews eventually flipped his car over and he was able to walk away.

"Somebody got squirrelly," Busch said. "Just felt like a slow carnival ride. I just got t-boned there and the end and it just kind of toppled me over."

Keselowski, Ambrose, Patrick and Hamlin were involved in the first big crash.

Aric Almirola avoided the melee both times and was in the lead when rain forced another red-flag period 28 laps short of the scheduled finish. The race remains on hold at 2:30 p.m. as the speedway tries to dry the track.

There were 17 cars on the lead lap after the second big crash, and only 21 of 43 remaining in the race.